Detection of Magnetocaloric Effects in BaFe11TiO19 Both Directly and Inversely

We report on simulations of BaFe11TiO19’s magnetocaloric effect (MCE) at temperatures between about 4 and 250 K. The MCE in BaFe11TiO19 unexpectedly displays two forms. Among 33 and 204 K, BaFe11TiO19 shows an inverse MCE due to noncollinear ordering. But when the FM goes from 4 to 33 K or over 204 K, a direct MCE is employed. BaFe11TiO19’s advantages may be useful in the hunt for magnetocaloric compounds that exhibit two or more successive magnetic phase changes. BaFe11TiO19 is therefore a very promising magnet for cryogenic refrigeration, with potential uses in the liquefaction and storage of various gases.